ListFolder recursive does not list every file

I am using the Dropbox .NET API. When I call ListFolder with recurse=true it seems to miss a small number of files which are deeply nested. I have a reproduceable case.

The files I expect to see are visible online and locally. They are listed if I ListFolder on the container or parent folder. But if I do the same with the root then it doesn't get returned.

I am checking result.HasMore and then using "Continue". Code is below.

Known issue? Am I doing something stupid?

 

            ListFolderResult result = await this.Client.Files.ListFolderAsync(
                new ListFolderArg(path, true, false, deleted));

            foreach (var entry in result.Entries)
            {
                handleEntry(entry);
            }

            while (result.HasMore)
            {
                result = await this.Client.Files.ListFolderContinueAsync(new ListFolderContinueArg(result.Cursor));

                foreach (var entry in result.Entries)
                {
                    handleEntry(entry);
                }
            }

            return result.Cursor;